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S. Ponce-Aix



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    MO25 - NSCLC - Combined Modality Therapy II (ID 112)

    • Event: WCLC 2013
    • Type: Mini Oral Abstract Session
    • Track: Mesothelioma
    • Presentations: 1
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      MO25.01 - Interim analysis of the Spanish Lung Cancer Group (SLCG) randomized phase II trial of thoracic radiotherapy (RT) concurrent with cisplatin (P) plus oral vinorelbine (OV) or etoposide (E) for unresectable locally advanced (LA) stage III non-small cell lung cancer (NSCLC). (GECP10/02). (ID 2658)

      10:30 - 12:00  |  Author(s): S. Ponce-Aix

      • Abstract
      • Presentation
      • Slides

      Background
      Chemoradiation is the standard of care for the treatment of unresectable LA-NSCLC. Cisplatin plus either etoposide or vinorelbine are two of the chemotherapy (CT) regimens widely used for the disease concurrently with radiotherapy. Oral vinorelbine is a formulation which has achieved comparable results to the IV vinorelbine. The purpose of the study is to evaluate the efficacy and safety of cisplatin when combined with etoposide or oral vinorelbine with radical radiation for the management of stage III NSCLC.

      Methods
      Patients (pts) between 18 and 75 years, with histologically proven untreated and unresectable LA stage IIIA/IIIB NSCLC, adequate bone marrow, hepatic and renal function, ECOG PS 0-1, were randomized to: Arm OV-P: OV 60 mg/m[2] D1, D8 cycle 1 and 80 mg/m[2] cycle 2 (if no grade 3-4 toxicity) plus P 80 mg/m[2] D1 every 3 weeks for 2 cycles as induction; patients without progression received OV 40 mg/m[2] D1, D8, and P 80 mg/m[2] D1 every 3 weeks for 2 more cycles (4 cycles in total). Arm E-P: E 50 mg/m[2] intravenously D1 to D5 plus P 50 mg/m[2] D1, D8 every 4 weeks for 2 cycles. Both regimens administered with concurrent RT 66 Gy in 6.5 weeks. The primary endpoint was progression free survival using RECIST 1.1, and secondary endpoints were overall response rate, overall survival, and safety profile. To guarantee an overall type-1 α error (one side) no greater than 0.05 and a type II (β) error 0.1 for the primary endpoint of PFS, a sample size of 134 pts allocated in a 1:1 ratio is planned.

      Results
      Since August 2011 77 pts have been recruited. 46 pts have been included in the interim analysis, 23 pts have been randomly allocated to each treatment arm. Patient’s characteristics were: Male 91.3%; median age 64 (range 44-75); PS1 56.5%; smokers 46.8%; adenocarcinoma 40.4% / squamous 55.3%; stage IIIA 46.8% / IIIB 53.2%. Median of months between initial diagnosis and study start was 1 (range 0.3-15.7). Safety: 118 cycles (cy) were analysed, 79 in arm OV-P and 39 in arm E-P. Hematological toxicities arms OV-P/E-P (% cy): grade (g) 3/4 neutropenia 8.9%/13.1%; g3 thrombocytopenia 0%/5.3%; g3 anemia 0%/2.6%; febrile neutropenia 3 cases on OV-P arm (all during induction CT on cy 1) and 1 case on E-P arm (during concurrent chemoradiation). Non-hematological toxicities arms OV-P/E-P (% cy): g3 esophagitis/mucositis 1.3%/15.5%; g3 infection without neutropenia 1.3%/5.1%. No treatment-related deaths were reported. There was no remarkable difference in other toxicities between both arms. 39 pts completed the treatment as per protocol, 19 in arm OV-P and 20 in arm E-P. Overall response rates were 73.7% and 50% for the OV-P and the E-P arm, respectively.

      Conclusion
      This interim analysis shows that OV-P and E-P when administered concurrently with RT have a manageable safety profile with efficacy. Safety data is consistent with other studies reported for both chemoradiation regimens. Based on these positive results for safety, accrual is ongoing. Clinical trial information EudraCT 2010-022927-31.

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    P3.01 - Poster Session 3 - Cancer Biology (ID 147)

    • Event: WCLC 2013
    • Type: Poster Session
    • Track: Biology
    • Presentations: 1
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      P3.01-015 - <b>Outcome in pemetrexed/cisplatin-treated non-small-cell lung cancer (NSCLC) patients according to mRNA expression levels of BRCA1, TS, AEG1 and REV3 </b> (ID 1170)

      09:30 - 16:30  |  Author(s): S. Ponce-Aix

      • Abstract

      Background
      REV3, the catalytic subunit of the translesion synthesis (TLS) polymerase x, can continue replication past DNA adducts. Depletion of REV3 sensitizes A549 lung cancer cells to cisplatin. REV3 expression is part of a gene signature that predicted pemetrexed sensitivity in 17 NSCLC cell lines. BRCA1, TS, AEG1 and RAP80 are involved in DNA damage repair through homologous recombination. The homologous recombination and TLS pathways have non-redundant functions in response to cisplatin. We hypothesized that low mRNA expression of these genes – either alone or in combination – could confer improved outcome to cisplatin/pemetrexed in NSCLC patients.

      Methods
      REV3, BRCA1, RAP80, TS and AEG1 mRNA expression was examined by quantitative RT-PCR and categorized by terciles. Expression of each gene was correlated with outcome in 47 cisplatin/pemetrexed-treated NSCLC patients.

      Results
      63.8% male; 47% smokers; 80.9% ECOG PS 1; 80.8% adenocarcinoma. Overall response rate was 51%, with no differences according to expression levels of any of the genes. Progression-free survival (PFS) for patients with low, intermediate and high BRCA1 levels was 13.4, 5.5 and 3.9 months (m), respectively (P=0.005). Similar differences in PFS were observed according to TS (P=0.003) and AEG1 (P<0.001) expression. The hazard ratio (HR) for PFS for patients with high BRCA1 levels was 4 (P=0.002). Overall survival (OS) for patients with low, intermediate and high BRCA1 levels was 29.7, 7.4 and 6.3 m, respectively (P=0.05). Similar differences in OS were observed according to TS (P=0.005) and AEG1 (P=0.001) expression. HR for OS for patients with high BRCA1 levels was 3.6 (P=0.004). There were no differences in PFS or OS according to REV3 or RAP80 levels. However, the joint effect of BRCA1 and REV3 was significant for predictive modeling. PFS for patients with low, intermediate and high levels of both genes was 14.9, 7.2 and 2.8 m, respectively (P=0.001). OS for patients with low, intermediate and high levels of both genes was 29.7, 7.8 and 6.3 m, respectively (P=0.04).

      Conclusion
      Low BRCA1 expression predicts longer PFS and OS in pemetrexed/cisplatin-treated NSCLC p. Low TS and AEG1 levels have similar predictive value. The combination of low BRCA1 and REV3 expression confers longer PFS and OS. Analysis of these genes could be useful for customizing pemetrexed/platinum chemotherapy.